2002-01-22 11:30:46 +08:00
|
|
|
//===----------------------------------------------------------------------===//
|
2001-10-31 12:28:11 +08:00
|
|
|
// LLVM 'GCCAS' UTILITY
|
|
|
|
//
|
|
|
|
// This utility is designed to be used by the GCC frontend for creating
|
|
|
|
// bytecode files from it's intermediate llvm assembly. The requirements for
|
|
|
|
// this utility are thus slightly different than that of the standard as util.
|
|
|
|
//
|
2002-01-22 11:30:46 +08:00
|
|
|
//===----------------------------------------------------------------------===//
|
2001-10-31 12:28:11 +08:00
|
|
|
|
|
|
|
#include "llvm/Module.h"
|
2002-01-31 08:46:22 +08:00
|
|
|
#include "llvm/PassManager.h"
|
2001-10-31 12:28:11 +08:00
|
|
|
#include "llvm/Assembly/Parser.h"
|
|
|
|
#include "llvm/Transforms/CleanupGCCOutput.h"
|
2001-11-01 10:41:09 +08:00
|
|
|
#include "llvm/Transforms/LevelChange.h"
|
2001-10-31 14:36:48 +08:00
|
|
|
#include "llvm/Transforms/ConstantMerge.h"
|
2002-01-22 09:04:08 +08:00
|
|
|
#include "llvm/Transforms/ChangeAllocations.h"
|
2002-05-08 04:03:27 +08:00
|
|
|
#include "llvm/Transforms/Scalar.h"
|
2002-06-25 23:57:43 +08:00
|
|
|
#include "llvm/Analysis/Verifier.h"
|
2002-01-22 11:30:46 +08:00
|
|
|
#include "llvm/Bytecode/WriteBytecodePass.h"
|
2001-11-27 08:03:19 +08:00
|
|
|
#include "Support/CommandLine.h"
|
2002-04-19 03:55:25 +08:00
|
|
|
#include "Support/Signals.h"
|
2001-10-31 12:28:11 +08:00
|
|
|
#include <memory>
|
|
|
|
#include <fstream>
|
2002-06-26 05:57:48 +08:00
|
|
|
using std::cerr;
|
2001-10-31 12:28:11 +08:00
|
|
|
|
2002-07-22 10:10:13 +08:00
|
|
|
static cl::opt<string>
|
|
|
|
InputFilename(cl::Positional, cl::desc("<input llvm assembly>"), cl::Required);
|
|
|
|
|
|
|
|
static cl::opt<string>
|
|
|
|
OutputFilename("o", cl::desc("Override output filename"),
|
|
|
|
cl::value_desc("filename"));
|
|
|
|
|
|
|
|
static cl::opt<int>
|
|
|
|
RunNPasses("stopAfterNPasses",
|
|
|
|
cl::desc("Only run the first N passes of gccas"), cl::Hidden,
|
|
|
|
cl::value_desc("# passes"));
|
|
|
|
|
|
|
|
static cl::opt<bool>
|
|
|
|
StopAtLevelRaise("stopraise", cl::desc("Stop optimization before level raise"),
|
|
|
|
cl::Hidden);
|
|
|
|
|
|
|
|
static cl::opt<bool>
|
|
|
|
Verify("verify", cl::desc("Verify each pass result"));
|
|
|
|
|
2002-06-25 23:57:43 +08:00
|
|
|
|
|
|
|
static inline void addPass(PassManager &PM, Pass *P) {
|
|
|
|
static int NumPassesCreated = 0;
|
|
|
|
|
|
|
|
// If we haven't already created the number of passes that was requested...
|
|
|
|
if (RunNPasses == 0 || RunNPasses > NumPassesCreated) {
|
|
|
|
// Add the pass to the pass manager...
|
|
|
|
PM.add(P);
|
|
|
|
|
|
|
|
// If we are verifying all of the intermediate steps, add the verifier...
|
|
|
|
if (Verify) PM.add(createVerifierPass());
|
|
|
|
|
|
|
|
// Keep track of how many passes we made for -stopAfterNPasses
|
|
|
|
++NumPassesCreated;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void AddConfiguredTransformationPasses(PassManager &PM) {
|
|
|
|
if (Verify) PM.add(createVerifierPass());
|
|
|
|
|
|
|
|
addPass(PM, createFunctionResolvingPass()); // Resolve (...) functions
|
|
|
|
addPass(PM, createConstantMergePass()); // Merge dup global constants
|
|
|
|
addPass(PM, createDeadInstEliminationPass()); // Remove Dead code/vars
|
|
|
|
addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
|
|
|
|
addPass(PM, createCleanupGCCOutputPass()); // Fix gccisms
|
|
|
|
addPass(PM, createIndVarSimplifyPass()); // Simplify indvars
|
|
|
|
|
|
|
|
// Level raise is eternally buggy/in need of enhancements. Allow
|
|
|
|
// transformation to stop right before it runs.
|
|
|
|
if (StopAtLevelRaise) return;
|
|
|
|
|
|
|
|
addPass(PM, createRaisePointerReferencesPass());// Eliminate casts
|
|
|
|
addPass(PM, createPromoteMemoryToRegister()); // Promote alloca's to regs
|
2002-07-10 03:53:09 +08:00
|
|
|
// Disabling until this is fixed -- Vikram, 7/7/02.
|
|
|
|
// addPass(PM, createReassociatePass()); // Reassociate expressions
|
2002-06-25 23:57:43 +08:00
|
|
|
addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
|
|
|
|
addPass(PM, createDeadInstEliminationPass()); // Kill InstCombine remnants
|
|
|
|
addPass(PM, createLICMPass()); // Hoist loop invariants
|
|
|
|
addPass(PM, createGCSEPass()); // Remove common subexprs
|
|
|
|
addPass(PM, createSCCPPass()); // Constant prop with SCCP
|
|
|
|
|
|
|
|
// Run instcombine after redundancy elimination to exploit opportunities
|
|
|
|
// opened up by them.
|
|
|
|
addPass(PM, createInstructionCombiningPass());
|
|
|
|
addPass(PM, createAggressiveDCEPass()); // SSA based 'Agressive DCE'
|
|
|
|
addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
|
|
|
|
}
|
|
|
|
|
2001-10-31 12:28:11 +08:00
|
|
|
|
|
|
|
int main(int argc, char **argv) {
|
2001-10-31 12:33:33 +08:00
|
|
|
cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
|
2001-10-31 12:28:11 +08:00
|
|
|
|
|
|
|
std::auto_ptr<Module> M;
|
|
|
|
try {
|
|
|
|
// Parse the file now...
|
|
|
|
M.reset(ParseAssemblyFile(InputFilename));
|
|
|
|
} catch (const ParseException &E) {
|
2002-07-01 00:19:14 +08:00
|
|
|
cerr << E.getMessage() << "\n";
|
2001-10-31 12:28:11 +08:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (M.get() == 0) {
|
|
|
|
cerr << "assembly didn't read correctly.\n";
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (OutputFilename == "") { // Didn't specify an output filename?
|
2002-01-21 06:54:45 +08:00
|
|
|
std::string IFN = InputFilename;
|
2001-10-31 12:28:11 +08:00
|
|
|
int Len = IFN.length();
|
|
|
|
if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
|
2002-01-21 06:54:45 +08:00
|
|
|
OutputFilename = std::string(IFN.begin(), IFN.end()-2);
|
2001-10-31 12:28:11 +08:00
|
|
|
} else {
|
|
|
|
OutputFilename = IFN; // Append a .o to it
|
|
|
|
}
|
|
|
|
OutputFilename += ".o";
|
|
|
|
}
|
|
|
|
|
2002-06-26 05:57:48 +08:00
|
|
|
std::ofstream Out(OutputFilename.c_str(), std::ios::out);
|
2002-01-22 11:30:46 +08:00
|
|
|
if (!Out.good()) {
|
2001-10-31 12:28:11 +08:00
|
|
|
cerr << "Error opening " << OutputFilename << "!\n";
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2002-04-19 03:55:25 +08:00
|
|
|
// Make sure that the Out file gets unlink'd from the disk if we get a SIGINT
|
|
|
|
RemoveFileOnSignal(OutputFilename);
|
|
|
|
|
2001-10-31 12:28:11 +08:00
|
|
|
// In addition to just parsing the input from GCC, we also want to spiff it up
|
|
|
|
// a little bit. Do this now.
|
|
|
|
//
|
2002-01-21 15:31:50 +08:00
|
|
|
PassManager Passes;
|
2002-06-25 23:57:43 +08:00
|
|
|
|
|
|
|
// Add all of the transformation passes to the pass manager to do the cleanup
|
|
|
|
// and optimization of the GCC output.
|
|
|
|
//
|
|
|
|
AddConfiguredTransformationPasses(Passes);
|
|
|
|
|
|
|
|
// Write bytecode to file...
|
|
|
|
Passes.add(new WriteBytecodePass(&Out));
|
2001-10-31 12:28:11 +08:00
|
|
|
|
2002-01-22 11:30:46 +08:00
|
|
|
// Run our queue of passes all at once now, efficiently.
|
2002-06-25 23:57:43 +08:00
|
|
|
Passes.run(*M.get());
|
2001-10-31 12:28:11 +08:00
|
|
|
return 0;
|
|
|
|
}
|